US5567114A - Fan closure flap - Google Patents

Fan closure flap Download PDF

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Publication number
US5567114A
US5567114A US08/427,794 US42779495A US5567114A US 5567114 A US5567114 A US 5567114A US 42779495 A US42779495 A US 42779495A US 5567114 A US5567114 A US 5567114A
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US
United States
Prior art keywords
flap
latch
case
opening
counterweight arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US08/427,794
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English (en)
Inventor
Allen K. Wallace
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FF Seeley Nominees Pty Ltd
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FF Seeley Nominees Pty Ltd
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Publication date
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Assigned to F F SEELEY NOMINEES PTY LTD. reassignment F F SEELEY NOMINEES PTY LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WALLACE, ALLAN KENNETH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1486—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by bearings, pivots or hinges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/007—Ventilation with forced flow

Definitions

  • This invention relates to closure means for closing the outlet opening of a fan casing which, for example, may be a volute (scroll) of a fan of the centrifugal type, or the outlet of an axial flow type fan. It is particularly useful for a fan assembly mounted outside of a building, to avoid inflow of cold outside air in the winter.
  • centrifugal fans secured to the external structures of buildings for delivering air through ducts to the interiors of the buildings.
  • Fan closure means which is arranged to be inserted in the eye of a fan case volute, for example at the end of a season, to inhibit down drafts of air from external winds into a building and to inhibit warm air escaping from the building through the duct.
  • Such an arrangement functions very satisfactorily, but requires manual positioning which is sometimes most inconvenient.
  • a flap which is hinged with respect to a fan case volute and which is movable between an open position wherein it causes minimal interference with free flow of air being delivered to a duct from a fan, to a closed position where it blocks the outlet opening of the fan, and a latch to retain the flap in its closed position until sufficient static pressure is built up by the fan to cause it to open, whereupon it moves to an open position where it has little or no effect on the free flow of air emitting from the outlet opening.
  • a flap hinge means hinging the flap to the casing for movement between a normally closed position wherein said flap at least partly closes said outlet opening and an open position wherein there is a free flow of air from said opening, a counterweight arm associated with said flap and hinge means hinging said flap towards its normally closed position, and a latch releasably retaining said flap in its closed position, the latch comprising resilient means deflected upon latch release.
  • FIG. 1 is an isometric side elevation showing a fan case volute with a closure flap in its closed position and being retained there by a counterweight which is also associated with a retention latch;
  • FIG. 2 is a diagrammatic plan showing the flap, the bearing arrangement for pivotal movement of the flap, the counterweight and the latch;
  • FIG. 3 shows the counterweight and latch in a partly sectioned side elevation, in a view taken on line 3--3 of FIG. 2;
  • FIG. 4 shows an alternative arrangement which is a second embodiment.
  • a fan case volute 10 of a centrifugal fan is in accordance with known art having an inlet 11 and an outlet 12, the fan being operable in the normal way to draw air through the inlet 11 and discharge through the outlet 12.
  • the outlet 12 In the winter months when air conditioning is not required in certain climates, it is desirable that the outlet 12 should be closed against downdrafts, and to this end there is provided a flap 13 which can be opened by the static pressure of air when the fan is operating, but it is otherwise normally closed.
  • a counterweight arm 15 is carried on an extending end of pivot shaft 16 which carries flap 13, via an engaging spigot 17 which non-rotatably engages in aperture 18 on inner end of shaft 16.
  • a stub axle 20 on the side of flap 13 from spigot 17 is rotatable in bearing 21 carried on the casing volute 10, and is co-axial with shaft 16, which is also rotatable in bearing 22.
  • flap 13 and countershaft 15 are both generally horizontal, although this is not essential.
  • the clockwise moment due to the counterweight is greater than the anticlockwise moment due to weight of the flap 13, so that when the fan is not operative, the flap 13 will close outlet 12 as shown in FIG. 3. In doing so it will pass pivoted latch 25 which is carried on one end of leaf spring 26, and latch 25 will need to deflect spring 26 (FIG. 3) to allow opening of flap 13. This will occur only upon the fan being energised, since it is only under those conditions that the standing pressure of air on flap 13 is sufficient to deflect spring 26.
  • flap 13 approaches vertical a balanced condition is approached, and air flow past the flap 13 is sufficient to retain the flap open. The constraint against free flow of air is negligible.
  • the swivel lock 28 can swivel about pin 29 to overlie counterweight 15 (or latch 25, or both) to retain flap 13 closed during transport of the fan.
  • FIG. 4 shows a second embodiment which is preferred to the first embodiment, not because it functions better, but because it is much simpler.
  • Counterweight arm 15 has an upstanding spigot 36, and the central part of the outer surface of latch 32 has two spaced lugs 37 which define a slot 38 between them, and this accommodates spigot 36 when in the transport mode.
  • This transport mode is the position shown in dashed lines in FIG. 4.
  • latch 32 can hold counterweight arm 15 against counter clockwise rotation under most conditions of transport, the transport mode is nonetheless provided to assure the flap 13 will be maintained in its closed position during shipment.
  • the invention will be seen to be exceedingly simple but is nevertheless effective in substantially reducing if not eliminating down draft and the device can be constructed so that probability of malfunction is very small.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Flow Control Members (AREA)
US08/427,794 1994-04-27 1995-04-26 Fan closure flap Expired - Lifetime US5567114A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM5302A AUPM530294A0 (en) 1994-04-27 1994-04-27 Fan closure means
AUPM5302 1994-04-27

Publications (1)

Publication Number Publication Date
US5567114A true US5567114A (en) 1996-10-22

Family

ID=3779879

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/427,794 Expired - Lifetime US5567114A (en) 1994-04-27 1995-04-26 Fan closure flap

Country Status (7)

Country Link
US (1) US5567114A (enrdf_load_stackoverflow)
CN (1) CN1086797C (enrdf_load_stackoverflow)
AU (1) AUPM530294A0 (enrdf_load_stackoverflow)
ES (1) ES2123370B1 (enrdf_load_stackoverflow)
GR (1) GR1002875B (enrdf_load_stackoverflow)
IN (1) IN183424B (enrdf_load_stackoverflow)
ZA (1) ZA953330B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5919582A (en) * 1995-10-18 1999-07-06 Aer Energy Resources, Inc. Diffusion controlled air vent and recirculation air manager for a metal-air battery
US6087029A (en) * 1998-01-06 2000-07-11 Aer Energy Resources, Inc. Water recovery using a bi-directional air exchanger for a metal-air battery
US6350537B1 (en) 1998-12-18 2002-02-26 Aer Energy Resources, Inc. Load responsive air door for an electrochemical cell
US6454247B2 (en) 1999-12-13 2002-09-24 Ff Seeley Nominees Pty Ltd Anti-backdraft shutter assembly for an axial flow fan
US20070134110A1 (en) * 2005-12-12 2007-06-14 Meng-Chic Lin Fan capable of resisting reversed flow
US20100329873A1 (en) * 2009-06-25 2010-12-30 Daniel Ruba Retaining and sealing ring assembly
US20110052398A1 (en) * 2009-08-27 2011-03-03 Roy David Fulayter Fan assembly
US20110076148A1 (en) * 2009-09-30 2011-03-31 Roy David Fulayter Fan
US20140065944A1 (en) * 2012-08-30 2014-03-06 Ronald Hugh Chamness Vent cover with biased door

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105781548A (zh) * 2016-03-07 2016-07-20 安庆市德创机电产品设计有限公司 风动振动器排风智能旋转组件

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1613897A (en) * 1926-01-29 1927-01-11 Lichty Metal Products Company Intake ventilator
US2502736A (en) * 1948-12-22 1950-04-04 Reuben J Marcoe Intake vent
US3479947A (en) * 1968-01-15 1969-11-25 Chore Time Equipment Ventilator unit
US4385552A (en) * 1981-04-16 1983-05-31 Marvin Nabben Exhaust fan and anti-backdraft shutter assembly

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3538945A (en) * 1967-12-21 1970-11-10 First Missouri Dev Finance Cor Constant volume regulator for air duct systems
GB1580050A (en) * 1976-05-19 1980-11-26 Colt International Ventilators
US4850265A (en) * 1988-07-01 1989-07-25 Raydot Incorporated Air intake apparatus
FR2666839B1 (fr) * 1990-09-17 1993-04-16 Souchier Fages Sa Systeme de desenfumage pour facades de batiment.
US5201685A (en) * 1991-04-25 1993-04-13 Raydot, Incorporated Integral air intake apparatus
US5293920A (en) * 1993-07-08 1994-03-15 Michael Vagedes Louvered basement vent

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1613897A (en) * 1926-01-29 1927-01-11 Lichty Metal Products Company Intake ventilator
US2502736A (en) * 1948-12-22 1950-04-04 Reuben J Marcoe Intake vent
US3479947A (en) * 1968-01-15 1969-11-25 Chore Time Equipment Ventilator unit
US4385552A (en) * 1981-04-16 1983-05-31 Marvin Nabben Exhaust fan and anti-backdraft shutter assembly

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5919582A (en) * 1995-10-18 1999-07-06 Aer Energy Resources, Inc. Diffusion controlled air vent and recirculation air manager for a metal-air battery
US6087029A (en) * 1998-01-06 2000-07-11 Aer Energy Resources, Inc. Water recovery using a bi-directional air exchanger for a metal-air battery
US6350537B1 (en) 1998-12-18 2002-02-26 Aer Energy Resources, Inc. Load responsive air door for an electrochemical cell
US6454247B2 (en) 1999-12-13 2002-09-24 Ff Seeley Nominees Pty Ltd Anti-backdraft shutter assembly for an axial flow fan
US20070134110A1 (en) * 2005-12-12 2007-06-14 Meng-Chic Lin Fan capable of resisting reversed flow
US8419370B2 (en) 2009-06-25 2013-04-16 Rolls-Royce Corporation Retaining and sealing ring assembly
US20100329873A1 (en) * 2009-06-25 2010-12-30 Daniel Ruba Retaining and sealing ring assembly
US20110052398A1 (en) * 2009-08-27 2011-03-03 Roy David Fulayter Fan assembly
US8469670B2 (en) 2009-08-27 2013-06-25 Rolls-Royce Corporation Fan assembly
US20110076148A1 (en) * 2009-09-30 2011-03-31 Roy David Fulayter Fan
US8435006B2 (en) 2009-09-30 2013-05-07 Rolls-Royce Corporation Fan
US20140065944A1 (en) * 2012-08-30 2014-03-06 Ronald Hugh Chamness Vent cover with biased door
US9157652B2 (en) * 2012-08-30 2015-10-13 Ronald Hugh Chamness Vent cover with biased door

Also Published As

Publication number Publication date
IN183424B (enrdf_load_stackoverflow) 2000-01-01
AUPM530294A0 (en) 1994-05-19
CN1118428A (zh) 1996-03-13
GR950100169A (en) 1995-12-31
CN1086797C (zh) 2002-06-26
ES2123370B1 (es) 1999-08-16
ES2123370A1 (es) 1999-01-01
GR1002875B (el) 1998-03-11
ZA953330B (en) 1996-02-13

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